Question

引起：android.database.sqlite.SQLiteException：接近“CREATE_TABLE”：语法错误（代码1）:,同时编译：CREATE_TABLE用户（用户名TEXT，密码TEXT）;

公共类MyDB扩展了SQLiteOpenHelper {

private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "users.db";
private static final String TABLE_USERS = "users";
private static final String COLUMN_ID = "_id";
private static final String COLUMN_USERNAME = "username";
private static final String COLUMN_PASSWORD = "password";


public MyDB(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
    super(context, DATABASE_NAME, factory, DATABASE_VERSION);
}

// called when database is first created
@Override
public void onCreate(SQLiteDatabase db) {
    String query = "CREATE_TABLE " + TABLE_USERS + "(" +
         //   COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL DEFAULT 1" +
            COLUMN_USERNAME + " TEXT, " +
            COLUMN_PASSWORD + " TEXT " +
            ");";

    db.execSQL(query);
}

Answer 1

SQL CREATE TABLE语句中没有下划线。将"CREATE_TABLE "更改为"CREATE TABLE "。

另见the relevant documentation。

Answer 2

另外，快速提示。您不必告诉SQL COLUMN_ID是INTEGER PRIMARY KEY AUTOINCREMENT。 SQL中的INTEGER PRIMARY KEY将始终采用行ID的值。唯一一次必须添加INCREMENT时，如果您在删除数据时不想要重复使用的值（因为，就像我之前说的那样，它需要行的ID）。

android studio SQLite创建表查询语法错误

2 个答案: